/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import java.lang.reflect.Method;
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public class Main {
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class MyClassA {}
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class MyClassB extends MyClassA {}
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public static void main(String[] args) throws Exception {
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testReferenceTypePropagation();
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invokeTestInliner();
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}
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// Reference type propagation (RTP) used to assume that if a class is final,
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// then the type must be exact. This does not hold for arrays which are always
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// final, i.e. not extendable, but may be assigned to from values of the
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// components type subclasses.
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public static void testReferenceTypePropagation() throws Exception {
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boolean expectTrue;
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// Bug #1: RTP would set the type of `array` to exact Object[]. Instruction
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// simplifier would then simplify the instanceof to `false`.
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Object[] array = $noinline$getArray();
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expectTrue = array instanceof MyClassA[];
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if (!expectTrue) {
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throw new Exception("Incorrect type check.");
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}
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// Bug #2: This is the true-branch of the instanceof above. The bound type
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// for `array` would be again set to exact MyClassA[] and incorrectly
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// simplify the second instanceof to `false`.
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expectTrue = array instanceof MyClassB[];
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if (!expectTrue) {
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throw new Exception("Incorrect type bound.");
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}
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}
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public static void invokeTestInliner() throws Exception {
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Class<?> c = Class.forName("TestCase");
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Method m = c.getMethod("testInliner");
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m.invoke(null);
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}
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public static Object[] $noinline$getArray() {
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if (doThrow) throw new Error();
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return new MyClassB[2];
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}
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static boolean doThrow = false;
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}
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